Magnetism

Question 1

magnets produce

Answer 1

magnetic fields

Question 2

when placed inside a magnetic field, magnetic materials experience

Answer 2

a force

Question 3

do non magnetic materials experience a force when put into a magnetic field

Answer 3

NO

Question 4

magnetism is an example of what type of force ( contact or no contact)

Answer 4

non contact

Question 5

magnets have a _ and _ pole

Answer 5

South and North

Question 6

opposite poles

Answer 6

attract

Question 7

like poles

Answer 7

repel

Question 8

a magnetic material becomes ___ when in a magnetic field

Answer 8

magnetised

Question 9

why does a magnetic material become magnetised when placed in a magnetic field

Answer 9

the poles shift so that the mini magnets within the magnet are opposite to the pole of the material, causing it to become magnetised

Question 10

what happens when a magnetic material is taken out of a magnetic field

Answer 10

it goes back to its unmagnetised state

Question 11

the force between a magnet and. magnetic material is always attractive or repulsive

Answer 11

attractive

Question 12

magnetic materials can be __ or __

Answer 12

soft or hard

Question 13

Magnetically soft materials (2)

Answer 13

are easy to magnetise
don’t remain magnetised for long ( temporarily magnetised)

Question 14

Magnetically hard materials (2)

Answer 14

are difficult to magnetise

Do not easily lose their magnetism (permanently magnetised)

Question 15

Permanent magnets are made out of magnetically __ materials

Answer 15

hard

Question 16

Electromagnets are made out of magnetically ___ materials

Answer 16

soft

Question 17

what does the fact that electromagnets are made of soft material mean

Answer 17

they can be made magnetic or non-magnetic as an when required

Question 18

what is an electromagnet

Answer 18

magnet that runs on electricity

Question 19

what core is used for electromagnets and why

Answer 19

Iron because it is easily magnetised

Question 20

how do you increase the strength of an electromagnet

Answer 20

• increase current
• increase number of coils

Question 21

factors that affect the strength of an electromagnet (4)

Answer 21

voltage
current
number of coils
proximity to magnetic field

Question 22

uses of electromagnets

Answer 22

doorbells

Question 23

why are soft magnets used for electric bells rather than permanent magnets

Answer 23

if you induce a magnetic material then it would stop ringing as soon as the current stops passing through the wire but with a permanent magnet the ringing would just continue

Question 24

what is a magnetic field

Answer 24

an area where a magnetic field experiences a force

Question 25

what is a magnet

Answer 25

an object that produces its own magnetic field

Question 26

magnetic field lines go from __ to __

Answer 26

North to South

Question 27

magnetic forces occur due to

Answer 27

the interactions between 2 magnetic fields

Question 28

a uniform magnetic field is formed when / between

Answer 28

between the opposite poles of 2 permanent magnets

Question 29

when field lines are closer together, field is

Answer 29

stronger

Question 30

when magnetic field lines are further apart, they are

Answer 30

weaker

Question 31

the magnetic field is __ near the poles and weaker ____ (where)

Answer 31

stronger

away from the magnet

Question 32

4 magnetic materials

Answer 32

iron
cobalt
nickel
steel

Question 33

is induced magnetism temporary or permanent

Answer 33

temporary

Question 34

example of soft magnetic material

Answer 34

iron

Question 35

example of hard magnetic material

Answer 35

steel

Question 36

soft magnetic materials are produced to make

Answer 36

electromagnets

Question 37

hard magnetic materials are used to produce

Answer 37

permanent magnets like bar magnets